Marco owns the following portfolio of stocks. What is the expected return on his portfolio?

Stock L- Amount invested :2400 Return on Stock: 6%

Stock M- Amount Invested 10,000 Return on Stock 7.5%

Stock N - Amount Invested 3600 Return on Stock 12.6%

A) 4.7% B) 6.6% C) 8.4% D) 8.7%